I think the really reasons why this altcoins is dumping down is bitcoins is gainings its price again in $1200 mark.As you may have observe when bitcoins price is at dumps altcoins like eth and dash are pumping its price and now thats bitcoins is gaining price again viceversa effect will happen.i think that is why and that is what i conclude in this happenings
Correlative but not causative. More likely people were just buying up alts with their bitcoins after the mild BU panic, causing selling pressure and the false value increase in the alts. But as people recover their wits (and of course the temptation of getting back more bitcoins with those inflated alt prices) they've restored their holdings in bitcoin and the price has returned to pre-pump stages.